
1) Type of Warfare
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https://www.crosswordclues.com/clue/trench-warfare

Trench warfare is a form of land warfare using occupied fighting lines consisting largely of trenches, in which troops are significantly protected from the enemy`s small arms fire and are substantially sheltered from artillery. The most prominent case of trench warfare is the Western Front in World War I. It has become a byword for stalemate, att....
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http://en.wikipedia.org/wiki/Trench_warfare

warfare in which opposing armed forces attack, counterattack, and defend from relatively permanent systems of trenches dug into the ground. The ... [7 related articles]
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http://www.britannica.com/eb/a-z/t/77

Trench warfare is a method of conducting hostilities which was very greatly developed during the Great War, but examples of which had previously occurred both in South Africa and Manchuria. In Manchuria both armies resorted freely to 'digging in' tactics, and in South Africa the Boers evolved a new kind of trench usually cut in a hill-side, in whic...
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http://www.probertencyclopaedia.com/browse/FT.HTM
noun a type of armed combat in which the opposing troops fight from trenches that face each other; `instead of the war ending quickly, it became bogged down in trench warfare`
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https://www.encyclo.co.uk/local/20974
No exact match found.